Press blanket



Dec. 13, 1932. w. FENNONE 1,891,150

PRESS BLANKET Filed Jan. 22. 1951 Patented Dec. 13, 1932 N FFICE WILLIAM lIEEl\T}.fOl.\l'E, OF SAN FRANCISCO, GALFOVRNIA rnnss BLANKn'r Application filed January 22, 1831. Serialv No. 510,562.

This invention relates to improvements in press blankets. In the operations of general printing, and particularly in high speed work such as newspaper printing, it is the general practice to cushion the cylinders opposed to the impression or type carrying cylinders with what is known as an overlay which is prepared either by hand cutting or mechanical operations. These overlays, which are usually hard packed, are expensive and tedious in preparation and necessitate two to three hours time' yfor each cylinder to which they are applied. Y

Accordingly, an object of my invention is the provision of an improved press blanket for use on high speed'color, black and white, magazine-rotary, and/ory flat bed printing presses of all types which gives a more sharp and clear impression than blankets hitherto in use. A further object is the provision of a blanket of the above character which eliminates the necessity of making up the mechanical, or hand-cut overlays and which is etlicient and practical in operation;r A further object is the provision of an improved press blanket by which the'proper impression on high speed work, such as newspaper printing, may be obtained. A further. object is to provide a press blanket which is simple and economical in preparation and construction and which may be readily applied to and removed from the impression cylinders of printing presses when necessary. A further objectis the provision of an improved press blanket which brings out effectively the different tones of a half tone cut, and which also results in greater densityvin full or solid tone'printing. A further object is the provision of a press blanket which is characterized in use by aneven pull across the cylinder to which is applied, `with the known advantageous results. l p y p V Otherrobjects will be in part obvious and in part` hereinafter pointed out in connection with the following analysis of the invention when taken in connection'with the accompanying drawing illustrating one of various possible embodiments of the invention.

In the drawing-` l Fig. l is a face view of one unit of my improved press blanket, certain portions of the various layers thereof being removed for clearness of description; i

Fig@ is a face view of another unit of the blanket, similarly illustrated;

Fig. 3 is an edge view of the blanket unit shown in Fig. l and illustrating the various layers thereof Fig. llis an edge view ofthe blanket unit of Fig. 2; Y 50 Fig. 5 is a schematic representation of my improved blanket as applied to a magazine rotary printing. press illustrating the relation thereof to the impression or plate cylinder and the work being printed. @5

According to my invention, I provide a press blanket consist-ing of top unit A (Figs. l and 3) and a bottom unit B (FigsQ and 4), of which the top unit A is constituted by a body layer l0 of paper or paper felt, to one face of which is adhesively secured a backing 1l of a woven textile fabric material, preferably muslin, which material functions to strengthen and hold together the paper felt of the layer l0. The adhesive or bond 12, 75 which is illustrated as a layer between the paper felt and backinglayers, is preferably composed vof yflour and water, which is applied in paste form and which hardens 'when dried. lt will be' readily apparent that the 'g nature of the adhesive is such as to permeate to a substantial depth the paper felt layer to which it is applied, and also to pass through or permeate the mesh of the fabric layer 1l, as to form an eiiicient bond therebetween.

The term paper felt is used to designate a heavy porous paper stock, and is comparable to paper used in building construction. While l do not wish to be limited to the following proportions of the ingredients mak- 9 ing up the paper felt, I find that themost ad` vantageous paper felt for the use herein intended is composed of the following ingredients in the named proportions: 40% cotton and wool rags, 50% wood pulp, and 10% jute D liber. Paper felt so composed is readily manufactured on a conventional paper machine. rlhe bottom unit B is preferably constituted by a base layer l5 of a relatively stiff paper 100 material such as paper liber board, a top layer 16 of paper, preferably manilal paper or its equivalent in weight and texture, and an adhesive or bond 17 therebetween, which may be composed of flour and water worked to a paste, as previously described in connection with the top blanket aforesaid.

In Fig. 5 wherein is shown one application of my press blanket, the reference character 20 designates a plate cylinder on the periphery of which is arranged a plate 21 carrying the usual type or impression surfaces. Opposed to cylinder 20 is a blanket cylinder 22 carrying the blanket units A and B as aforesaid, each unit in this instance being composed of two substantially semi-cylindrical sections suitably secured as in the securing notches 23. The bottom unit B is applied about the periphery of cylinder 22, with its base layer 15 engaging the steel of the cylinder, and the top unit A disposed thereover with its backing layer 11 contacting the top layer 16 of the bottom unit B. Upon proper securement, the units form a composite whole, it being understood, however, that either or both units are readily and effectively replaceable. Preferably, a conventional top sheet or tympan (not shown) is arranged over and relatively outwardly of the top unit A, as is well understood in the art.

The reference character designates a web or sheet of paper fed between the cylinders for receiving the impression plate 21, it being understood that the opposed surfaces of the cylinders 20, 22 are in substantial contact and the printing impression is applied to the paper 25 with the press blanket as aforesaid forming a cushioning means for lthe impression surfaces and the paper web or sheet engaged thereby.

It has been found in actual practice that my improved press blanket is as equally suitable in high speed and color printing as the expensive and time taking hard packed overlays prepared by hand or mechanical processes. This is in part due to the fact that the adhesive, when dried, hardens, and, having permeated to some extent the porous paper felt layer 10 as well as the mesh of the fabric layer 11, forms a packed cushioning surface I having the characteristics in use of a hard packed overlay. This feature causes also a sharp and clear impression, and by reason of the even packing an even uniform pull of the impression surfaces across the blanket is obtained. It has been further ascertained that no stretching of my blanket occurs and that the oils and greases from the cylinder bearings do not affect it in any way.

It will be seen that the several objects of the invention are achieved and other advantageous results attained. As many changes could be made in carrying out the above invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A press blanket unit comprising a layer of paper felt, a backing of woven textile fabric, and a layer of adhesive material between the paper felt and the backing forming a bond therebetween, the adhesive material, upon application, being capable of permeating the first-named layer and the fabric backing, and of hardening when dry.

2. A press blanket unit comprising a layer of paper felt, the paper felt being composed substantially of Ll0% cotton and wool rags, 50% wood pulp, and 10% jute fibers, and a backing layer of woven textile fabric adhesively secured to said first-named layer.

3. A press blanket unit comprising a layer of paper felt being composed substantially of cotton and wool rags, 50% wood pulp, and 10% jute fibers, a backing layer of woven textile fabric, and a layer of adhesive material between the paper felt and the backing and forming a hardened bond therebetween.

4. A press blanket unit comprising a layer of paper felt, the paper felt being composed substantially of 40% cotton and wool rags, wood pulp, and 10% jute fibers, a backing layer of woven textile fabric, and a layer of adhesive material between the paper felt and the backing and forming a hardened bond therebetween, the adhesive material being composed of flour and water in suitable proportions.

5. A press blanket including a layer of paper felt, a backing of commercial muslin, and a layer of adhesive material between the layer and the backing and forming a bond therebetween, the adhesive material, upon application, being capable of permeating the first-named layer and the muslin backing, and of hardening When dry.

6. A press blanket including a layer of paper felt, said layer being composed substantially of 40% cotton and wool rags, 50% wood pulp, and 10% jute fiber, a backing of commercial muslin fabric, and a layer of adhesive material between the first-named layer and the backing and forming a hardened bond therebetween.

7. A composite press blanket comprising, in combination, a bottom unit comprising a layer of relatively stiff paper material and a layer of more flexible paper adhesively secured thereto, and a top unit comprising a layer of paper felt and a backing of woven textile fabric adhesively secured thereto.

8. A composite press blanket comprising, in combination, a bottom unit comprising a layer of paper fiber board and a layer of manila paper adhesively secured thereto, and a. top unit comprising a layer of paper felt and a backing of woven textile fabric adhesively secured thereto.

9. A composite press blanket comprising, in combination, a bottom unit comprising a layer of paper liber board, a layer of manila paper adhesively secured thereto, and a layer of adhesive forming a bond between said first layers, and a top unit comprising a layer of paper felt and a backing of Woven textile fabric adhesively secured thereto, said paper felt being composed substantially of 40% cotton and Wool rags, 50% Wood pulp, and 10% jute fibers.

10. A composite press blanket comprising, in combination, a bottom unit comprising a layer of paper fiber board, a layer of manila paper adhesively secured thereto, and a layer of adhesive forming a bond between said rst layers, and a top unit comprising a layer of paper felt, a backing layer of a textile fabric material, and a layerof adhesive forming a. bond between the paper felt and backing layers, said last-named layer, upon application, being capable of entering the pores or interstices of the paper felt and passing through the mesh of the fabric material, and of hardening When dry.

l1. A composite press blanket comprising, in combination, a bottom unit comprising a layer of paper fiber board, a layer of manila paper adhesively secured thereto, and a layer of adhesive forming a bond between said first layers, and a top unit comprising a layer of paper felt, a backing layer of a textile fabric material, and a layer of adhesive forming a bond between the paper felt and backing layers, both said adhesive layers comprisina paste capable of hardening when dry.

igned at San Francisco, California, this 5th day of December, 1930.

WILLIAM FENNONE. 

